Regional Advection Perturbations in an Irrigated Desert (RAPID) experiment
Regional Advection Perturbations in an Irrigated Desert (RAPID) experiment
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DOI：
10.1007/s00704-004-0096-x
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发表时间：
2005-04
影响因子：
3.4
通讯作者：
H. D. de Bruin;O. Hartogensis;R. G. Allen;J. Kramer
中科院分区：
文献类型：
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作者：
H. D. de Bruin;O. Hartogensis;R. G. Allen;J. Kramer
RAPID 现场实验于 1999 年 8 月至 9 月在美国爱达荷州双子瀑布以南 25 公里处进行。该实验涉及对覆盖着快速生长的作物紫花苜蓿的大片、灌溉良好的田地进行微气象观测。白天，有几天感热通量为负值，潜热通量超过净辐射。潜热通量大于净辐射所需的能量必须从其他地方平流输送。由于区域很大，我们将这个过程称为“区域平流”。另一方面，“局部平流”是指平流效应，其中湿到干的转变是在现场规模上的。证据表明RAPID数据受到区域平流条件的影响。基于Penman-Monteith的简单模型被导出，该模型很好地描述了区域平流情况。使用数据和模型说明了这些条件下风速的影响。温度和水平风分量之间的相关系数似乎是平流的良好指标。
The RAPID field experiment took place in August–September 1999 at a site 25 km south of Twin Falls, Idaho, USA. The experiment concerned micrometeorological observations over extensive, well-irrigated fields covered with the fast-growing crop alfalfa. During daytime, on a number of days the sensible heat flux was negative and the latent heat flux exceeded net radiation. The energy required for the latent heat flux to be larger than net radiation has to be advected from elsewhere. As the fields were large, we refer to this process as “regional advection”. “Local advection”, on the other hand, refers to advection effects, where the wet to dry transition is on a field scale. Evidence is presented that the RAPID data are subject to regional advection conditions.A simple model, based on Penman-Monteith, is derived that describes the regional-advection case rather well. The influence of wind speed under those conditions is illustrated using data and the model. The correlation coefficients between temperature and horizontal wind component appear to be good indicators for advection.